new box need a port

this is what i have-all outside of the box----41''w--20''tall---24''deep--thats like--10.1cf-i think---port i have is 6.5''w--18.5''tall---17''deep---is this right would like to tune it to -32hz-to-35hz--if any one can help me out with a better port it would be nice--this box is for -2-15''--sundown subs thay told me to do like-4cf to-4.75cf-ea sub---i wont the subs up port back--let me no what you think--any help would be nice-and thanks

Edited June 4, 200916 yr by just1moreamp